Z 2 1 1 z 4 July 8, 2019 16 32 64 128 Z 2 z 1 4 0 Z 2 1 5 z 3 1 4 Z 1 3 1 z 2 4 1 4 z 1 2 z 1 5 z 200 to __ Khai triển z 2 1 1 z 4 2 z 1 )+ 3 z 1 )= 4 2z Z 2 z 1 4 factorise Z 2 1 5 z 3 1 4 solve Z 2 1 5 z 3 1 4 solution 4 z 1 )= 2 z 1 )+ 18 3 z 1 2 4z z 1
